// 实现这个项目的构建任务
const del = require('del');
const browserSync = require('browser-sync');
const loadPlugins = require('gulp-load-plugins'); // 自动加载所有gulp插件的插件
const plugins = loadPlugins();

const {
  src,
  dest,
  parallel,
  series,
  watch
} = require('gulp');

const bs = browserSync.create(); // 自动创建一个热更新的开发服务器

const data = {
  menus: [
    {
      name: 'Home',
      icon: 'aperture',
      link: 'index.html'
    },
    {
      name: 'Features',
      link: 'features.html'
    },
    {
      name: 'About',
      link: 'about.html'
    },
    {
      name: 'Contact',
      link: '#',
      children: [
        {
          name: 'Twitter',
          link: 'https://twitter.com/w_zce'
        },
        {
          name: 'About',
          link: 'https://weibo.com/zceme'
        },
        {
          name: 'divider'
        },
        {
          name: 'About',
          link: 'https://github.com/zce'
        }
      ]
    }
  ],
  pkg: require('./package.json'),
  date: new Date()
}

const clean = () => {
  return del(['dist', 'temp']);
}

const style = () => {
  return src('src/assets/styles/*.scss', {
      base: 'src'
    })
    .pipe(plugins.sass({
      outputStyle: 'expanded'
    }))
    .pipe(dest('temp'))
}

const scripts = () => {
  return src('src/assets/scripts/*.js', {
      base: 'src'
    })
    .pipe(plugins.babel({
      presets: ['@babel/preset-env']
    }))
    .pipe(dest('temp'))
}

const page = () => {
  return src('src/*.html', {
      base: 'src'
    })
    .pipe(plugins.swig({
      data,
      cache: false
    }))
    .pipe(dest('temp'));
}

const image = () => {
  return src('src/assets/images/**', {
      base: 'src'
    })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'));
}

const font = () => {
  return src('src/assets/fonts/**', {
      base: 'src'
    })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'));
}

const extra = () => {
  return src('public/**', {
      base: 'public'
    })
    .pipe(dest('dist/public'));
}

const release = () => {
  return src('temp/*.html', {
      base: 'temp'
    })
    .pipe(plugins.useref({
      searchPath: ['temp', '.']
    }))
    // html css js 压缩
    .pipe(plugins.if(/\.js$/, plugins.uglify()))
    .pipe(plugins.if(/\.html$/, plugins.htmlmin({
      collapseWhitespace: true,
      minifyCSS: true,
      minifyJS: true
    })))
    .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
    .pipe(dest('dist'));
}

const server = () => {
  watch('src/assets/styles/*.scss', style);
  watch('src/assets/scripts/*.js', scripts);
  watch('src/*.html', page);
  // watch('src/assets/images/**', image);
  // watch('src/assets/fonts/**', font);
  // watch('public/**', extra);
  watch(['src/assets/images/**', 'src/assets/fonts/**', 'public/**'], bs.reload);

  bs.init({
    notify: false,
    // port: 8080,
    open: true,
    files: 'temp/**', // 哪些文件改变触发热更新
    server: {
      baseDir: ['temp', 'src', 'public'],
      routes: {
        '/node_modules': 'node_modules'
      }
    }
  })
}

const compile = parallel(style, scripts, page);
const build = series(clean, parallel(series(compile, release), image, font, extra));
const start = series(compile, server);

module.exports = {
  clean,
  build,
  start,
  style
}